John,
Bear in mind that if you need 2Mbps for *each* link, you'll need more than
a single 2 Mbps frame relay service at the central site (unless you're
happy with that much oversubscription). You could use a high-bandwidth
frame relay or ATM service (> 2Mbps) interworking with 2 Mbps services at
each of the remote sites. Telstra does high-bandwidth frame relay and I
expect that other carriers do as well - plenty do ATM. The high-bandwidth
service will need an HSSI or ATM port on the router, not a standard serial
port, so if your routers are already fixed that may cause a problem. I
haven't yet used the high-bandwidth frame relay or ATM, so I'm not speaking
from personal experience. If you're using different telcos at the
international sites check that they will interwork - I've never looked into
that.
If you're stuck with 2Mbps interfaces on your routers you may have to look
at either multiple 2Mbps services at the central site, oversubscription, or
just use point to point links. When the number of PVCs on a central access
drops below a certain point, it's more cost-effective to just do simple
point to point links.
For redundancy, you could use ISDN on demand (PRI if you want 2 Mbps,
unless you're really into trying to blend vast numbers of BRIs together).
You'd probably need a PRI at each remote site plus one or more at the
central site - again, it depends on how much oversubscription of your
redundancy capability you need - what if your central frame/ATM service
goes down?
You could also look at backup PVCs - some telcos offer a service where a
backup PVC will kick in if a service fails. You pay about 10% of the
standard cost of the backup PVC. You can't use the backup PVC except in a
failure situation.
Just some quick thoughts before I shoot through for the day -
aveagoodweekend...
JMcL
---------------------- Forwarded by Jenny Mcleod/NSO/CSDA on 16/03/2001
04:55 pm ---------------------------
"John Brandis" <[EMAIL PROTECTED]>@groupstudy.com on
16/03/2001 12:31:35 pm
Please respond to "John Brandis" <[EMAIL PROTECTED]>
Sent by: [EMAIL PROTECTED]
To: <[EMAIL PROTECTED]>
cc:
Subject: Internetwork Design Question
HI @groupstudy members
Got a question for you. I have just started at a startup network company
and they wish to have links to about 10 different locations (some of
them overseas). What we need is that these links come into a central
site (home office router) and we also have some sort of redundant
backup should one of these links fail. One of our needs is that each
link have a bandwidth of 2MB/S.
My idea was to install and configure a frame relay device in the central
office then organize for for the remote offices to terminate the frame
relay channel in their respective offices.
Can some one pass on a comment from previous experience in regards to
the service that I am trying to create. Any constructive information is
much appreciated.
John B
[EMAIL PROTECTED]
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